IEC 62271-200

IEC 62271-200 covers AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV up to and including 52 kV, indoor and outdoor, at frequencies up to 60 Hz. It supplements the component product standards for enclosed equipment and is aligned to IEC 62271-1. For fabrication the practical differences from low-voltage work are larger clearances, more demanding surface and edge finish because field stress rises with voltage, and an internal-arc classification regime that has no low-voltage equivalent.